Mechanism of pore evolution in electron beam welding joints of Mo-14Re alloy

Xianjun Wang; Junzhou Yang; Shichen Wang; Zhixuan Wang; Ning Xiong; Boliang Hu; Li Wang; Hairui Xing; Di Dong; Muhammad Muzamil; Ping Hu

Journal of Materials Research and Technology (May 2024)

Mechanism of pore evolution in electron beam welding joints of Mo-14Re alloy

Xianjun Wang,
Junzhou Yang,
Shichen Wang,
Zhixuan Wang,
Ning Xiong,
Boliang Hu,
Li Wang,
Hairui Xing,
Di Dong,
Muhammad Muzamil,
Ping Hu

Affiliations

Xianjun Wang: School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Junzhou Yang: School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Corresponding author. Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Shichen Wang: School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Zhixuan Wang: National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an, 710055, China; School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Ning Xiong: Advanced Technology & Materials Co., Ltd., Beijing, 100094, China; ATTL Advanced Materials Co., Ltd., Beijing, 100094, China
Boliang Hu: School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Li Wang: School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Hairui Xing: School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an, 710055, China
Di Dong: Advanced Technology & Materials Co., Ltd., Beijing, 100094, China; ATTL Advanced Materials Co., Ltd., Beijing, 100094, China
Muhammad Muzamil: Department of Mechanical Engineering, NED University of Engineering and Technology, Karachi, 75270, Pakistan
Ping Hu: School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Corresponding author. Xi'an University of Architecture and Technology, Xi'an, 710055, China.

Journal volume & issue: Vol. 30
pp. 6457 – 6463

Abstract

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The mechanism of pore evolution in vacuum electron beam joints of Mo-14Re alloy has been thoroughly investigated. Microscopic characterization methods, including Optical Microscopy (OM) and Scanning Electron Microscopy (SEM), were employed to explore the evolution mechanism of pore defects at different locations. Weld defects were further characterized using Energy Dispersive Spectroscopy (EDS) and Transmission Electron Microscopy (TEM), providing insights into their formation mechanisms. The findings reveal that pores along grain boundaries are the result of MoO and CO bubble aggregation. Non-equilibrium solidification of the melt triggers chemical reactions, transforming MoO and CO bubbles into MoO3 and C, with lower melting points. MoO3 and C persist in the pores, leading to the formation of grain boundary gas hole defects. On the other hand, intragranular pore defects stem from an abundance of pores within the matrix material. Upon entry of gas from these pores into the molten pool, its escape is impeded due to the intense influence of the molten pool. After the molten pool completes the cooling and solidification process, the gas remains within the crystal, resulting in intragranular pore defects.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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